#include <stdio.h>

int main(void){
    int num1 = 10;
    printf("num1:%d\n",num1);

    num1 = 20;
    printf("num1:%d\n",num1);

    scanf("%d",&num1);
    printf("num1:%d\n",num1);

    scanf("%d\n",&num1);
    printf("num1:%d\n",num1);

    return 0;
}